U.S. patent application number 15/804060 was filed with the patent office on 2018-05-10 for electric conduction component fixation structure.
The applicant listed for this patent is HONDA MOTOR CO., LTD. Invention is credited to Tadanobu Aoki, Yuki Endo, Munehiro Matsubara, Toru Nakamura.
Application Number | 20180130570 15/804060 |
Document ID | / |
Family ID | 62064409 |
Filed Date | 2018-05-10 |
United States Patent
Application |
20180130570 |
Kind Code |
A1 |
Matsubara; Munehiro ; et
al. |
May 10, 2018 |
ELECTRIC CONDUCTION COMPONENT FIXATION STRUCTURE
Abstract
An electric conduction component fixation structure includes: a
fixed member which has electrically conductive properties and on
which an electric conduction component is arranged; and a press
member that presses and fixes the electric conduction component,
which is arranged on the fixed member, to the fixed member, wherein
the fixed member includes a pressed surface that is pressed when
the electric conduction component is fixed by the press member, and
the pressed surface is covered by a rustproof coating film having a
plurality of metal flakes which are layered and a binder which
joins the plurality of metal flakes.
Inventors: |
Matsubara; Munehiro;
(Shimotsuga-gun, JP) ; Endo; Yuki;
(Shimotsuke-shi, JP) ; Aoki; Tadanobu;
(Utsunomiya-shi, JP) ; Nakamura; Toru;
(Utsunomiya-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HONDA MOTOR CO., LTD |
Tokyo |
|
JP |
|
|
Family ID: |
62064409 |
Appl. No.: |
15/804060 |
Filed: |
November 6, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01R 4/58 20130101; H02G
3/02 20130101; H01R 2201/26 20130101; H01R 4/34 20130101; H01B
5/002 20130101; H01R 4/64 20130101 |
International
Class: |
H01B 5/00 20060101
H01B005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 9, 2016 |
JP |
2016-218722 |
Claims
1. An electric conduction component fixation structure, comprising:
a fixed member which has electrically conductive properties and on
which an electric conduction component is arranged; and a press
member that presses and fixes the electric conduction component,
which is arranged on the fixed member, to the fixed member, wherein
the fixed member includes a pressed surface that is pressed when
the electric conduction component is fixed by the press member, and
at least the pressed surface of the fixed member is covered by a
rustproof coating film having a plurality of metal flakes which are
layered and a binder which joins the plurality of metal flakes.
2. The electric conduction component fixation structure according
to claim 1, wherein the press member is a bolt, the electric
conduction component is interposed between and held by a head part
of the bolt and the pressed surface of the fixed member, and a bolt
hole in which the bolt is screwed is provided on the fixed
member.
3. The electric conduction component fixation structure according
to claim 2, wherein the bolt has electrically conductive
properties, and at least any one of a contact surface with the
electric conduction component in the bolt, a male screw part of the
bolt, and an inner wall surface of the bolt hole is covered by the
rustproof coating film.
4. The electric conduction component fixation structure according
to claim 1, wherein the electric conduction component is an earth
terminal, and the fixed member is any of a vehicle body and a
vehicle body-side bracket.
5. The electric conduction component fixation structure according
to claim 2, wherein the electric conduction component is an earth
terminal, and the fixed member is any of a vehicle body and a
vehicle body-side bracket.
6. The electric conduction component fixation structure according
to claim 3, wherein the electric conduction component is an earth
terminal, and the fixed member is any of a vehicle body and a
vehicle body-side bracket.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] Priority is claimed on Japanese Patent Application No.
2016-218722, filed on Nov. 9, 2016, the contents of which are
incorporated herein by reference.
BACKGROUND
Field of the Invention
[0002] The present invention relates to an electric conduction
component fixation structure.
Background
[0003] In the related art, for example, an electric component that
is provided on a vehicle is grounded by so-called body earthing in
which the electric component is electrically connected to a vehicle
body via an earth cable, an earth terminal, a bracket, and the like
(for example, refer to Japanese Unexamined Patent Application,
First Publication No. 2014-187313).
SUMMARY
[0004] However, surfaces of the vehicle body and the bracket may be
covered generally by a coating film (hereinafter, referred to as a
"rustproof coating film") having rustproof properties. Therefore,
when the earth terminal (electric conduction component) is fixed to
the vehicle body, the bracket, and the like (fixed member), it is
necessary to exfoliate the rustproof coating film of a part to
which the earth terminal is fixed in order to ensure an electric
conduction property between the earth terminal and the vehicle
body, the bracket, and the like. As a result, rust may be generated
at the part of which the rustproof coating film is exfoliated, and
the rustproof properties may be degraded.
[0005] An object of an aspect of the present invention is to
provide an electric conduction component fixation structure that is
capable of ensuring an electric conduction property between an
electric conduction component and a fixed member without degrading
rustproof properties of the fixed member.
[0006] (1) An electric conduction component fixation structure
according to an aspect of the present invention includes: a fixed
member which has electrically conductive properties and on which an
electric conduction component is arranged; and a press member that
presses and fixes the electric conduction component, which is
arranged on the fixed member, to the fixed member, wherein the
fixed member includes a pressed surface that is pressed when the
electric conduction component is fixed by the press member, and at
least the pressed surface of the fixed member is covered by a
rustproof coating film having a plurality of metal flakes which are
layered and a binder which joins the plurality of metal flakes.
[0007] (2) In the above electric conduction component fixation
structure, the press member may be a bolt, the electric conduction
component may be interposed between and held by a head part of the
bolt and the pressed surface of the fixed member, and a bolt hole
in which the bolt is screwed may be provided on the fixed
member.
[0008] (3) In the above electric conduction component fixation
structure, the bolt may have electrically conductive properties,
and at least any one of a contact surface with the electric
conduction component in the bolt, a male screw part of the bolt,
and an inner wall surface of the bolt hole may be covered by the
rustproof coating film.
[0009] (4) In the above electric conduction component fixation
structure, the electric conduction component may be an earth
terminal, and the fixed member may be any of a vehicle body and a
vehicle body-side bracket.
[0010] In the electric conduction component fixation structure
according to the above aspect (1), the pressed surface of the fixed
member is covered by the rustproof coating film having the
plurality of metal flakes which are layered and the binder which
joins the plurality of metal flakes. Thereby, when the rustproof
coating film is pressed by the electric conduction component, the
rustproof coating film is compressed, the plurality of metal flakes
come into contact with each other, and the rustproof coating film
has electrically conductive properties. As a result, the electric
conduction component and the fixed member are electrically
connected to each other via the rustproof coating film, and
therefore, the electric conduction property between the electric
conduction component and the fixed member is ensured without
exfoliating the rustproof coating film of the fixed member.
Therefore, the electric conduction component fixation structure
according to the above aspect (1) can ensure the electric
conduction property between the electric conduction component and
the fixed member without degrading the rustproof properties of the
fixed member.
[0011] In the electric conduction component fixation structure
according to the above aspect (2), the press member is the bolt,
the electric conduction component is interposed between and held by
the head part of the bolt and the pressed surface of the fixed
member, and the bolt hole in which the bolt is screwed is provided
on the fixed member. Thereby, when the bolt is fastened, the
rustproof coating film is easily compressed by an axial force of
the bolt and has electrically conductive properties, and the
electric conduction component and the fixed member are electrically
connected to each other via the rustproof coating film. Therefore,
the electric conduction component fixation structure according to
the above aspect (2) can easily ensure the electric conduction
property between the electric conduction component and the fixed
member without degrading the rustproof properties of the fixed
member.
[0012] In the electric conduction component fixation structure
according to the above aspect (3), the bolt has electrically
conductive properties, and at least any one of the contact surface
with the electric conduction component in the bolt, the male screw
part of the bolt, and the inner wall surface of the bolt hole is
covered by the rustproof coating film. Thereby, when the bolt is
fastened, the rustproof coating film has electrically conductive
properties. Accordingly, in addition to the electric conduction
component and the fixed member being electrically connected to each
other, the electric conduction component and the fixed member are
electrically connected to each other via the bolt, and an electric
conduction path between the electric conduction component and the
fixed member is increased. Therefore, the electric conduction
component fixation structure according to the above aspect (3) can
enhance the electric conduction property between the electric
conduction component and the fixed member without degrading the
rustproof property of the fixed member.
[0013] In the electric conduction component fixation structure
according to the above aspect (4), since the electric conduction
component is the earth terminal, and the fixed member is any of the
vehicle body and the vehicle body-side bracket, by connecting an
electric component that is provided on the vehicle to the earth
terminal, it is possible to ground the electric component by body
earthing without exfoliating the rustproof coating film of the
fixed member. Therefore, the electric conduction component fixation
structure according to the above aspect (4) can realize body
earthing without degrading the rustproof properties of the fixed
member.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a schematic cross-sectional view showing an
electric conduction component fixation structure of a first
embodiment.
[0015] FIG. 2 is a cross-sectional view of a rustproof coating film
of FIG. 1.
[0016] FIG. 3 is a schematic cross-sectional view showing an
electric conduction component fixation structure of a second
embodiment.
[0017] FIG. 4 is a cross-sectional view showing an electric
conduction component fixation structure of Example.
[0018] FIG. 5 is a graph showing a relationship between a fastening
torque of a second bolt and an electric resistance value in the
electric conduction component fixation structure of Example.
DESCRIPTION OF THE EMBODIMENTS
[0019] Hereinafter, embodiments of the present invention will be
described with reference to the drawings.
First Embodiment
[0020] FIG. 1 is a schematic cross-sectional view showing an
electric conduction component fixation structure 1 of a first
embodiment of the present invention. In the electric conduction
component fixation structure 1 of the first embodiment, an electric
conduction component is an earth terminal 100. The electric
conduction component fixation structure 1 of the first embodiment
includes a bracket 10 (fixed member, vehicle body-side bracket), a
first bolt 20, and a second bolt 30 (press member).
[0021] The bracket 10 is formed, for example, of a metal material
such as iron in a flat plate shape and has electrically conductive
properties. A first insertion hole 51 through which the first bolt
20 is inserted is formed on an upper surface 10a of one side part
(first side part) 11 (right side part in FIG. 1) of the bracket 10.
The one side part 11 of the bracket 10 is arranged on a surface
200a of a vehicle body 200. A first bolt hole 61 in which the first
bolt 20 is screwed is provided on the vehicle body 200.
[0022] The earth terminal 100 is arranged on the upper surface 10a
of the other side part (second side part) 12 (left side part in
FIG. 1) of the bracket 10. A terminal insertion hole 50 through
which the second bolt 30 is inserted is formed on the earth
terminal 100. A second insertion hole 52 through which the second
bolt 30 is inserted is formed on a part, which corresponds to the
terminal insertion hole 50, of the upper surface 10a of the other
side part 12 of the bracket 10.
[0023] A weld nut 70 is welded concentrically with the second
insertion hole 52 to a more outside part of a lower surface 10b of
the other side part 12 than the second insertion hole 52. The weld
nut 70 has a second bolt hole 62 (bolt hole) in which the second
bolt 30 is screwed.
[0024] The first bolt 20 is formed of a metal material and has
electrically conductive properties. A male screw part 22 of the
first bolt 20 is inserted through the first insertion hole 51 of
the bracket 10 and is screwed in the first bolt hole 61 of the
vehicle body 200. Thereby, the one side part 11 of the bracket 10
is pressed by a head part 21 of the first bolt 20, is interposed
between and held by the head part 21 and the surface 200a of the
vehicle body 200, and is fixed to the vehicle body 200.
[0025] The second bolt 30 is formed of a metal material and has
electrically conductive properties. A male screw part 32 of the
second bolt 30 is inserted through the terminal insertion hole 50
of the earth terminal 100 and the second insertion hole 52 of the
bracket 10 and is screwed in the second bolt hole 62 of the weld
nut 70. Thereby, the earth terminal 100 is pressed by a head part
31 of the second bolt 30, is interposed between and held by the
head part 31 and a pressed surface 10c of the bracket 10, and is
fixed to the other side part 12. The pressed surface 10c is a part
which is pressed by the earth terminal 100 by an axial force that
is generated by fastening the second bolt 30.
[0026] A rustproof coating film 80 is formed by GEOMET (registered
trademark) on each of a surface of the bracket 10, a surface of the
first bolt 20, a surface of the second bolt 30, and a surface of
the weld nut 70. The rustproof coating film 80 is formed on the
surface of the bracket 10, and thereby, the rustproof coating film
80 is formed on the pressed surface 10c of the bracket 10.
[0027] FIG. 2 is a cross-sectional view of the rustproof coating
film 80. FIG. 2 shows a cross-section of the rustproof coating film
80 that is formed on the pressed surface 10c of the bracket 10. The
cross-section of the rustproof coating film 80 that is formed on
the other surfaces is the same as that of FIG. 2.
[0028] As shown in FIG. 2, the rustproof coating film 80 has a
plurality of metal flakes 81 which are layered and a binder 82
which joins the plurality of metal flakes 81. The metal flake is a
metal grain that is formed in a flake shape (flat shape). The
rustproof coating film 80 is formed in this way and thereby has
rustproof properties and an insulation property. When the rustproof
coating film 80 is pressed, the rustproof coating film 80 is
deformed while maintaining the rustproof properties, the plurality
of metal flakes 81 come into contact with one another, and thereby,
the rustproof coating film 80 has electrically conductive
properties. When the pressed state is released, the rustproof
coating film 80 has the insulation property again.
[0029] The electric conduction property at the time of the first
bolt 20 and the second bolt 30 being fastened in the electric
conduction component fixation structure 1 of the first embodiment
that has the above configuration is described.
[0030] As shown in FIG. 1, the first bolt 20 and the bracket 10 are
electrically connected to each other via the rustproof coating
films 80, 80 at the time of the first bolt 20 being fastened.
Specifically, the rustproof coating film 80 that is formed on the
lower surface of the head part 21 of the first bolt 20 and the
rustproof coating film 80 that is formed on the upper surface 10a
of the one side part 11 of the bracket 10 are pressed by an axial
force that occurs at the time of the first bolt 20 being fastened.
Thereby, both rustproof coating films 80, 80 have electrically
conductive properties. As a result, the head part 21 of the first
bolt 20 and the one side part 11 of the bracket 10 are electrically
connected to each other via both rustproof coating films 80,
80.
[0031] Further, the first bolt 20 and the vehicle body 200 are
electrically connected to each other via the rustproof coating film
80 at the time of the first bolt 20 being fastened. Specifically,
the rustproof coating film 80 that is formed on the surface of the
male screw part 22 of the first bolt 20 is pressed by the axial
force that occurs at the time of the first bolt 20 being fastened.
Thereby, the rustproof coating film 80 has electrically conductive
properties. As a result, the male screw part 22 of the first bolt
20 and the vehicle body 200 are electrically connected to each
other via the rustproof coating film 80.
[0032] Further, the bracket 10 and the vehicle body 200 are
electrically connected to each other via the rustproof coating film
80 at the time of the first bolt 20 being fastened. Specifically,
the rustproof coating film 80 that is formed on the lower surface
10b of the one side part 11 of the bracket 10 is pressed by the
axial force that occurs at the time of the first bolt 20 being
fastened. Thereby, the rustproof coating film 80 has electrically
conductive properties. As a result, the one side part 11 of the
bracket 10 and the vehicle body 200 are electrically connected to
each other via the rustproof coating film 80.
[0033] The second bolt 30 and the earth terminal 100 are
electrically connected to each other via the rustproof coating film
80 at the time of the second bolt 30 being fastened. Specifically,
the rustproof coating film 80 that is formed on the lower surface
of the head part 31 of the second bolt 30 is pressed by the axial
force that occurs at the time of the second bolt 30 being fastened.
Thereby, the rustproof coating film 80 has electrically conductive
properties. As a result, the head part 31 of the second bolt 30 and
the earth terminal 100 are electrically connected to each other via
the rustproof coating film 80.
[0034] Further, the earth terminal 100 and the bracket 10 are
electrically connected to each other via the rustproof coating film
80 at the time of the second bolt 30 being fastened. Specifically,
the rustproof coating film 80 that is formed on the pressed surface
10c of the bracket 10 is pressed by the axial force that occurs.
Thereby, the rustproof coating film 80 has electrically conductive
properties. As a result, the earth terminal 100 and the bracket 10
are electrically connected to each other via the rustproof coating
film 80.
[0035] Accordingly, as shown in FIG. 1, in the electric conduction
component fixation structure 1 of the first embodiment, at the time
of the first bolt 20 and the second bolt 30 being fastened, at
least four electric conduction paths A to D described below are
formed.
[0036] (1) Electric conduction path A: an electric conduction path
to the vehicle body 200 via the bracket 10 from the earth terminal
100
[0037] (2) Electric conduction path B: an electric conduction path
to the vehicle body 200 via the bracket 10 and the first bolt 20
from the earth terminal 100
[0038] (3) Electric conduction path C: an electric conduction path
to the vehicle body 200 via the second bolt 30 and the bracket 10
from the earth terminal 100
[0039] (4) Electric conduction path D: an electric conduction path
to the vehicle body 200 via the second bolt 30, the bracket 10, and
the first bolt 20 from the earth terminal 100
[0040] According to the electric conduction component fixation
structure 1 of the first embodiment, the pressed surface 10c of the
bracket 10 as the fixed member is covered by the rustproof coating
film 80 having the plurality of metal flakes 81 which are layered
and the binder 82 which joins the plurality of metal flakes 81.
Thereby, when the rustproof coating film 80 is pressed by the earth
terminal 100 as the electric conduction component, the rustproof
coating film 80 is compressed, the plurality of metal flakes 81
come into contact with each other, and the rustproof coating film
80 has electrically conductive properties. As a result, the earth
terminal 100 and the bracket 10 are electrically connected to each
other via the rustproof coating film 80, and therefore, the
electric conduction property between the earth terminal 100 and the
bracket 10 is ensured without exfoliating the rustproof coating
film 80 of the bracket 10. Therefore, the electric conduction
component fixation structure 1 of the present embodiment can ensure
the electric conduction properties between the earth terminal 100
and the bracket 10 without degrading the rustproof property of the
bracket 10.
[0041] Further, in the electric conduction component fixation
structure 1, the press member is the second bolt 30, the earth
terminal 100 is interposed between and held by the head part 31 of
the second bolt 30 and the pressed surface 10c of the bracket 10,
and the second bolt hole 62 in which the second bolt 30 is screwed
is provided on the bracket 10. Thereby, when the second bolt 30 is
fastened, the rustproof coating film 80 is easily compressed by an
axial force of the second bolt 30 and has electrically conductive
properties, and the earth terminal 100 and the bracket 10 are
electrically connected to each other via the rustproof coating film
80. Therefore, the electric conduction component fixation structure
1 of the present embodiment can easily ensure the electric
conduction property between the earth terminal 100 and the bracket
10 without degrading the rustproof properties of the bracket
10.
[0042] Further, the second bolt 30 has electrically conductive
properties, and the contact surface with the earth terminal 100 in
the second bolt 30, the male screw part 32 of the second bolt 30,
and the inner wall surface of the second bolt hole 62 are covered
by the rustproof coating film 80. Thereby, when the second bolt 30
is fastened, the rustproof coating film 80 has electrically
conductive properties. Accordingly, in addition to the earth
terminal 100 and the bracket 10 being electrically connected to
each other, the earth terminal 100 and the bracket 10 are
electrically connected to each other via the second bolt 30, and an
electric conduction path between the earth terminal 100 and the
bracket 10 is increased. Therefore, the electric conduction
component fixation structure 1 of the present embodiment can
enhance the electric conduction properties between the earth
terminal 100 and the bracket 10 without degrading the rustproof
properties of the bracket 10.
[0043] Further, since the electric conduction component is the
earth terminal 100, and the fixed member is the bracket 10 that is
provided on the vehicle body 200, by connecting an electric
component (not shown) that is provided on the vehicle to the earth
terminal 100, it is possible to ground the electric component by
body earthing without exfoliating the rustproof coating film 80 of
the bracket 10. Therefore, the electric conduction component
fixation structure 1 of the present embodiment can realize body
earthing without degrading the rustproof properties of the bracket
10.
Second Embodiment
[0044] FIG. 3 is a schematic cross-sectional view showing an
electric conduction component fixation structure 101 of a second
embodiment of the present invention. In the electric conduction
component fixation structure 101 of the second embodiment, the same
reference numerals are given to parts similar to those of the
electric conduction component fixation structure 1 of the first
embodiment. The electric conduction component fixation structure
101 of the second embodiment includes a vehicle body 200 (fixed
member) and a bolt 110 (press member).
[0045] The earth terminal 100 is arranged on a surface of the
vehicle body 200. A bolt hole 120 in which the bolt 110 is screwed
is provided on a part, which corresponds to the terminal insertion
hole 50 of the earth terminal 100, of the surface of the vehicle
body 200.
[0046] The bolt 110 is formed of a metal material and has
electrically conductive properties. A male screw part 112 of the
bolt 110 is inserted through the terminal insertion hole 50 of the
earth terminal 100 and is screwed in the bolt hole 120 of the
vehicle body 200. Thereby, the earth terminal 100 is pressed by a
head part 111 of the bolt 110 by an axial force that occurs. The
earth terminal 100 is interposed between and held by the head part
111 of the bolt 110 and a pressed surface 200c of the vehicle body
200 and is fixed to the vehicle body 200. The pressed surface 200c
is a part, which is pressed by the earth terminal 100, of the
surface of the vehicle body 200 when the bolt 110 presses the earth
terminal 100.
[0047] A rustproof coating film 80 is formed on each of a surface
of the vehicle body 200 and a surface of the bolt 110. Thereby, the
rustproof coating film 80 is formed on the pressed surface 200c of
the vehicle body 200. The electric conduction properties at the
time of the bolt 110 being fastened in the electric conduction
component fixation structure 101 of the second embodiment that has
the above configuration is described.
[0048] The earth terminal 100 and the vehicle body 200 are
electrically connected to each other via the rustproof coating film
80 at the time of the bolt 110 being fastened. Specifically, the
rustproof coating film 80 that is formed on the pressed surface
200c of the vehicle body 200 is pressed by the axial force that
occurs at the time of the bolt 110 being fastened. Thereby, the
rustproof coating film 80 has electrically conductive properties.
As a result, the earth terminal 100 and the vehicle body 200 are
electrically connected to each other via the rustproof coating film
80.
[0049] Further, the bolt 110 and the earth terminal 100 are
electrically connected to each other via the rustproof coating film
80 at the time of the bolt 110 being fastened. Specifically, the
rustproof coating film 80 that is formed on the lower surface of
the head part 111 of the bolt 110 is pressed by the axial force
that occurs at the time of the bolt 110 being fastened. Thereby,
the rustproof coating film 80 has electrically conductive
properties. As a result, the head part 111 of the bolt 110 and the
earth terminal 100 are electrically connected to each other via the
rustproof coating film 80.
[0050] Further, the bolt 110 and the vehicle body 200 are
electrically connected to each other via the rustproof coating film
80 at the time of the bolt 110 being fastened. Specifically, the
rustproof coating film 80 that is formed on the surface of the male
screw part 112 of the bolt 110 is pressed by the axial force that
occurs at the time of the bolt 110 being fastened. Thereby, the
rustproof coating film 80 has electrically conductive properties.
As a result, the male screw part 112 of the bolt 110 and the
vehicle body 200 are electrically connected to each other via the
rustproof coating film 80.
[0051] Accordingly, as shown in FIG. 3, in the electric conduction
component fixation structure 101 of the second embodiment, at the
time of the bolt 110 being fastened, at least two electric
conduction paths E, F described below are formed.
[0052] (1) Electric conduction path E: an electric conduction path
directly to the vehicle body 200 from the earth terminal 100
[0053] (2) Electric conduction path F: an electric conduction path
to the vehicle body 200 via the bolt 110 from the earth terminal
100
[0054] The electric conduction component fixation structure 101 of
the second embodiment includes the vehicle body 200 on which the
earth terminal 100 is arranged and the bolt 110 that presses and
fixes the earth terminal 100, which is arranged on the vehicle body
200, to the vehicle body 200. In the electric conduction component
fixation structure 101 of the second embodiment, the rustproof
coating film 80 is formed on the pressed surface 200c of the
vehicle body 200 which is pressed by the earth terminal 100 when
the bolt 110 presses the earth terminal 100.
[0055] Thereby, it is possible to obtain operation and advantages
similar to the first embodiment. That is, when the rustproof
coating film 80 is pressed by the earth terminal 100 at the time of
the earth terminal 100 being fixed, the rustproof coating film 80
is deformed, the plurality of metal flakes 81 come into contact
with one another, and the rustproof coating film 80 has
electrically conductive properties. As a result, the earth terminal
100 and the vehicle body 200 are electrically connected to each
other via the rustproof coating film 80, and therefore, the
electric conduction properties between the earth terminal 100 and
the vehicle body 200 is ensured without exfoliating the rustproof
coating film 80 of the vehicle body 200. Therefore, the electric
conduction component fixation structure 101 of the second
embodiment can ensure the electric conduction properties between
the earth terminal 100 and the vehicle body 200 without degrading
the rustproof properties of the vehicle body 200.
[0056] Further, according to the electric conduction component
fixation structure 101 of the second embodiment, the electric
conduction component is the earth terminal 100, and the fixed
member is the vehicle body 200. In this case, by connecting an
electric component (not shown) that is provided on the vehicle to
the earth terminal 100, it is possible to ground the electric
component by body earthing without exfoliating the rustproof
coating film 80 of the vehicle body 200. Therefore, the electric
conduction component fixation structure 101 of the present
embodiment can realize body earthing without degrading the
rustproof properties of the vehicle body 200.
[0057] Next, the present invention is described showing Example and
an experimental result. The Example described below is merely an
example, and the present invention is not limited thereto.
[0058] FIG. 4 is a cross-sectional view showing an electric
conduction component fixation structure 201 of Example of the
present invention. In the electric conduction component fixation
structure 201 of Example, the same reference numerals are given to
parts which are the same as those of the electric conduction
component fixation structure 1 of the first embodiment. In the
electric conduction component fixation structure 201 of Example, an
insulation paper 210 is interposed between the vehicle body 200 and
the bracket 10. The second bolt 30 is screwed in a nut 220 below
the insulation paper 210. The insulation paper 210 is interposed
between and held by the nut 220 and the bracket 10.
[0059] In the electric conduction component fixation structure 201
of Example that has the above configuration, an electric resistance
value with respect to a fastening torque of the second bolt 30 was
measured. The electric resistance value was measured on the vehicle
body 200 side by causing a current to flow to the earth terminal
100. The measurement result is shown in the graph of FIG. 5.
[0060] FIG. 5 is a graph showing a relationship between a fastening
torque of the second bolt 30 and an electric resistance value in
the electric conduction component fixation structure 201 of
Example.
[0061] As shown in the graph of FIG. 5, it is found that the
electric resistance value is decreased as the fastening torque
(that is, an axial force that occurs) of the second bolt 30 is
increased. That is, it is known that when the earth terminal 100 is
fixed to the bracket 10, the rustproof coating film 80 between the
earth terminal 100 and the bracket 10 is pressed, and the electric
conduction properties is ensured.
[0062] The present invention is not limited to the embodiments
described above with reference to the drawings, and a variety of
modification examples can be considered within the technical
scope.
[0063] For example, in the embodiments described above, the
electric conduction component is the earth terminal 100; however,
the electric conduction component is not limited to the earth
terminal 100 and may be a component that is pressed by the press
member and that have electrically conductive properties.
[0064] Further, the second bolt 30 is adopted for the press member
in the first embodiment described above, and the bolt 110 is
adopted for the press member in the second embodiment; however, the
press member is not limited to the second bolt 30 and the bolt 110
and may be a member that press and fix the electric conduction
component to the fixed member. Accordingly, for example, the press
member may be a clip, a clamp member, and the like having a
predetermined clamping force.
[0065] Further, the rustproof coating film 80 is formed on the
surface of the second bolt 30 in the first embodiment described
above, and the rustproof coating film 80 is formed on the surface
of the bolt 110 in the second embodiment; however, the rustproof
coating film 80 may be formed on inner wall surfaces of the second
bolt hole 62 and the bolt hole 120. Alternatively, the rustproof
coating film 80 may be formed on both the surface of the bolt (the
second bolt 30 and the bolt 110) and the inner wall surfaces of the
bolt hole (the second bolt hole 62 and the bolt hole 120).
[0066] Further, in the embodiment described above, the rustproof
coating film 80 is formed on the surface of the bracket 10 as the
fixed member and the surface of the second bolt 30, and the
rustproof coating film 80 is formed on the surface of the vehicle
body 200 and the surface of the bolt 110 in the second embodiment;
however, the rustproof coating film 80 may be formed on at least
the pressed surface (the pressed surface 10c of the bracket 10, the
pressed surface 200c of the vehicle body 200) of the fixed
member.
[0067] Further, the embodiments are described using a case in which
the electric conduction component fixation structures 1, 101 are
applied to a vehicle; however, the applicable scope of the electric
conduction component fixation structures 1, 101 is not limited to a
vehicle, and the electric conduction component fixation structures
1, 101 may be used for other applications.
[0068] The configuration elements in the embodiments described
above can be appropriately replaced by known configuration elements
without departing from the scope of the present invention.
* * * * *